The controversy comes amid speculation about the goal of the meeting in Poland of top officials from 65 different countries-which also featured President Donald Trump's personal attorney Rudy Giuliani calling for regime change in Iran while speaking at a rally outside the summit on behalf of, as Robert Mackey of The Intercept put it, "a cult-like group of Iranian exiles who pay him to represent them".
Oman hosted the Israeli leader in October and several high-ranking Israeli ministers have also made visits to countries in the Gulf over the previous year.
The United States and Poland kicked off an worldwide conference on the Middle East on Wednesday.
Prime Minister Benjamin Netanyahu warned Iran Tuesday that Israeli missiles can travel "very far", on the eve of a conference in Poland about peace and security in the Middle East.
Netanyahu has said in recent weeks that Israel has carried out hundreds of attacks in Syria over the past several years and would ramp up its fight following the planned withdrawal of USA troops from the country.
The comments were made to reporters on the sidelines of the Warsaw Middle East ministerial following Netanyahu's meeting with the Sultanate of Oman's Minister Responsible for Foreign Affairs, Yusuf bin Alawi.
Palestinians have been heavily critical of the conference, With officials describing the meeting as an effort by the United States to advance its anti-Palestinian positions.
"Israeli public opinion should not be deceived into believing that the Palestinian issue is a dead issue", Prince Turki bin Faisal Al Saud told Israel's Channel 13 news in a lengthy interview in London.
The meeting, which took place on the sidelines of a Warsaw-hosted, US -sponsored worldwide conference on the Middle East, was lauded by each of the two sides.
Netanyahu is one of the highest-ranking officials in attendance at the summit, alongside foreign ministers and officials from 60 other countries.
"We are working all the time to block Iran".
Germany and France decided not to send their foreign ministers, while the European Union's foreign policy chief, Federica Mogherini, is also not attending because of scheduling issues, an EU official told Reuters.
Pompeo and Czaputowicz only mentioned Iran indirectly, carefully avoiding the impression that the summit's focus is an effort to isolate the Islamic Republic.
Kushner, who is President Donald Trump's son-in-law, will brief delegates behind closed doors on Thursday on US plans for peace between Palestinians and Israelis.